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Lines in rear window

Sael

New member
3
1
3
Buick Ownership
2018 TourX
Hello, I just purchased a 19,000 mile 2018 tourX essence and I have a question about the rearmost windows in the car. The drivers side rear window has lines in it like partial defrost lines, the rear window on the passenger side does not have these lines. I am wondering if anyone knows their purpose.
 

D2R

Well-known member
1,604
648
113
Michigan
Buick Ownership
2019 Regal TourX Essence
Why do we have a shark fin and those antenna is the question on my mind.
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